[MRCA] Pondering the conversion of the BC-620 radio for eithet Ham or CB use.
DSP3
jeepp at comcast.net
Thu May 31 08:07:38 EDT 2018
Maybe mentioned elsewhere but the wideband receiver will provide very
reduced recovery of audio from a NB signal. Usable, I guess, but not
great, at all. I do not know if the discriminator can be
adjusted/aligned to compensate?
Jeep - K3HVG
On 5/30/2018 11:10 PM, WW2RDO via MRCA wrote:
> The exemptions are there, but it's a moot point anyway, since we
> operate the BC-659 on 29.6 MHz and 29.1 MHz wide band.
>
> Mark
> WW2RDO
>
> In a message dated 5/30/2018 10:58:48 PM Eastern Standard Time,
> timsamm at gmail.com writes:
>
> Hi Mark - clipped from our earlier offline conversation:
> -----------------------------------------------------------------
> "Hi Mark - Yes, they must be modified to reduce the deviation
> below the max audio freq for "legal" operation between 28.3 and
> 29mc; they should be OK wideband only above 29 mc as I read Part
> 97.. But again I don't suppose anyone pays any attention to that..
>
> I don't see anything in the current Part 97 that addresses
> anything built before 1972 as being exempt. Maybe I missed it.
> Part 97 governs only Amateur Radio...We can still build and use
> our own gear but it still must be compliant with the Part 97 regs,
> not aware that there any exemptions for even that.."
>
> On Wed, May 30, 2018 at 7:38 PM, WW2RDO via MRCA
> <mrca at mailman.qth.net <mailto:mrca at mailman.qth.net>> wrote:
>
> Hello Tim,
> Check on exemptions for radios made before 1972. The BC-659
> most definitely qualifies, and is legal to operate unmodified
> on the upper end of the 10 meter band.
>
> Mark D.
> WW2RDO
>
> In a message dated 5/30/2018 7:38:36 PM Eastern Standard Time,
> timsamm at gmail.com <mailto:timsamm at gmail.com> writes:
>
> Hi Jim - points well taken. An attempt to modify a 620
> to operate the transmitter and receiver in AM mode (and
> illegally on CB channels) would certainly destroy the
> relic equally badly as putting a dreaded "CB" inside. I
> certainly would not do that.. It would probably also not
> work and then be relegated to visual display/scrap.. It
> would be akin to modifying a stock M38 jeep to meet
> today's emission and safety mandates in California...
> Freakinstein but not illegal.....Also, seems that few care
> about "FCC legalities" these days..
>
> True, you do need at least a General class to operate on
> the 10 meters FM segment. Also, a stock BC-659 is not
> "legal" on 10 meters anyway unless the transmitter
> deviation is significantly reduced..(Modulation index must
> be < 1....)
>
> Maybe the thing for a purist with a General class license
> is to put a BC-659 "Infantry" radio with reduced deviation
> into their vehicle assigned to "Armor/Art'y" and then
> challenge anyone to prove that that was never done in
> WWII. Bam! LOL Never say never....
>
> Tim
> N6CC
>
> On Wed, May 30, 2018 at 2:25 PM, J Mcvey via MRCA
> <mrca at mailman.qth.net <mailto:mrca at mailman.qth.net>> wrote:
>
>
> The easy solution is to use radios that are in the Ham
> bands, and get a general ham license, which is pretty
> easy to get.
>
> The BC659 FM is legal on the upper end of the 10 meter
> band . 29.6 Mhz is the FM simplex calling frequency.
>
> The thought of hacking up a decent WWII relic to put a
> CB inside makes me cringe...
>
> The original radios (BC620,659) that will work in the
> 11 meter CB band are FM modulated which is not allowed
> there.
> CB is AM/SSB only.
> Then again, who follows the rules on CB?
>
> On Wednesday, May 30, 2018, 1:47:22 PM EDT, Robert
> Nickels <ranickel at comcast.net
> <mailto:ranickel at comcast.net>> wrote:
>
>
> An old time Chicago ham told me an interesting story
> about the BC-603
> which is the receiver component of the SCR-508 that
> tuned from 20-28 Mhz
> - FM of course. The important feature to him was that
> it used a
> pushbutton-controlled local oscillator rather than
> crystals for the
> channel frequency. He'd just finished high school
> in the Chicago area
> where Motorola was located, and thanks to their
> influence, the local
> police were among the first to abandon medium wave AM
> for the newfangled
> VHF FM band, leaving many frustrated police-radio
> listeners behind.
>
> This fellow saw opportunity and purchased custom
> converters from
> Vanguard Electronics in Hollis NY to bring the new
> police frequencies
> down to the range of the BC-603. Then it was just a
> matter of setting
> the needed frequencies into the pushbuttons and wiring
> everything up.
> The BC-603 "tank radio" was plentiful and cheap at
> local surplus stores
> because most hams had little use for them, but that
> it could run from
> 12 volts and had squelch made it nearly ideal for his
> needs. He says
> he had no problem selling enough of these "mobile
> police receivers" to
> pay for college.
>
> 73, Bob W9RAN
>
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